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| Format: | Recurso digital |
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Zenodo
2020
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| Matèries: | |
| Accés en línia: | https://doi.org/10.5281/zenodo.5728101 |
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Taula de continguts:
- <p><b><i>Campodelphys ancylocephalus</i> gen. et sp. nov.</b></p><p>(Figs. 402, 403)</p><p><b>Typematerial</b>. Holotype (intact ♀, MNHN-IU-2013- 19281) paratypes (2 intact ♀♀, MNHN-IU-2014-21434), and dissectedparatype (♀, figured) from a colonial ascidian, <i>Cystodytes</i> sp. (MNHN-IT-2008-2635 = MNHN A3/ CYS /135), Gam Island, Raja Ampat, Danau Nine Gam marine lake, West Papua, Indonesia (00°26.970’S, 130°29.149’E), depth 0.5– 2m, L.J. Bell & L.E. Martin coll., 04 November 2007.</p><p><b>Etymology</b>. The specific name is the combination of Greek <i>ancyl</i> (=crooked) and <i>cephal</i> (=head), referring to the ventrally deflected cephalic region of the new species.</p><p><b>Descriptionoffemale</b>. Body (Fig. 402A) enclosed bythin membrane; cylindricaland 1.12 mm long. Prosome 0.92 mm long, slightly narrowed in mid-section and with maximum width (250 μm) at level of leg 1, unsegmented; cephalosome not defined from metasome, directed ventrally, bearing posteroventral tubercle on each side (Fig. 402A). Anterior region of prosome from rostrum to insertion of leg 4 occupying 65% of prosome length; legs 1–4 separated from one another by equal intervals along body. Freeurosome (Fig. 402B) curved, 5-segmented. Anal somite ornamented with paired patches of spinules ventrally (Fig. 402C). Caudalramus (Fig. 402C) small, about 1.6 timeslongerthan wide (23×14 μm): armed with 6 naked setae (1 outer lateral, 1 dorsal, and 4 distal).</p><p>Rostrum (Fig. 402D) as longas wide, weakly tapering proximally, abruptly tapering in distal 40 % towards blunt apex. Antennule (Fig. 402F) small, 71 μmlong, curved posteriorly, with 2 distinct articulations proximally and several partial sutures on posterior surface more distally; armedwith 2 setaeonfirst segment, 12 on second, and 17+aesthetasc on distal region. Antenna (Fig. 402F) stout, taperingdistally, 3-segmented; coxaandbasisunarmed; unsegmented endopod slightly longerthan wide: armed with 1 seta distally plus terminal claw, slightly longer than endopod.</p><p>Labrum (Fig. 402G) large, tapering, extended distally, unornamented. Mandible (Fig. 402H) with coxal gnathobase bearing pectinate medial margin; palp armed with 1 setaon basis, 4 setaeon exopod, and 1 and 4 setae on first and second endopodal segments, respectively; small medial seta on second endopodal segment narrow and naked, all other setae on rami broad and weakly pinnate. Maxillule (Fig. 402I) lobate, bearing 6 setae (2 medial and 4 distal). Maxilla (Fig. 402J) indistinctly 2- segmented and armed with 5 setae on first segment and 2 setae on small second segment (medial seta markedly broadened). Maxilliped (Fig. 402K) unsegmented, bearing 1 smallseta subdistally on medial margin.</p><p>Legs 1–4 (Fig. 403 A-D) biramous, broad, each with partially 2-segmented protopod, 2-segmented exopod, and unsegmented endopod; endopods much broader than exopods and directed mediodistally. Coxa of legs 1–4 unarmed, but basis bearing outer seta. Basis of leg 1 bearing spiniform innerdistal seta. All setae on rami of legs small and spiniform. Armature formula for legs 1–4 as follows:</p><table><tbody><tr><td></td><th>Coxa</th><th>Basis</th><th>Exopod</th><th>Endopod</th></tr><tr><th>Leg 1</th><td>0-0</td><td>1-1</td><td>1-0; 6</td><td>5</td></tr><tr><th>Leg 2</th><td>0-0</td><td>1-0</td><td>1-0; 9</td><td>6</td></tr><tr><th>Leg 3</th><td>0-0</td><td>1-0</td><td>1-0; 8</td><td>9</td></tr><tr><th>Leg 4</th><td>0-0</td><td>1-0</td><td>1-0; 7</td><td>5</td></tr></tbody></table><p>Leg 5 (Fig. 402B) represented by 1 minute seta.</p><p><b>Male</b>. Unknown.</p><p><b>Remarks</b>. In <i>Campodelphys ancylocephalus</i> <b>gen. et sp. nov</b>. all swimming legs have an unsegmented endopod, unlike the three congeneric species described above. The numbers of setae on the endopods of legs 1, 2, and 4 (5, 6, and 5, respectively) are smaller than those of its congeners. The presence of 6 setae on the maxillule and 7 setae on the maxilla are additional diagnostic features of the new species.</p>